Screw-cutter.



H. Y. BOVEE.

SCREW CUTTER.

APPLICATION FILED AUG.20. 1913.

1 1 5 1 ,85'7, Patented Aug. 31, 1915.

W I TNESSES: IN V EN TOR.

9% W fiffBovas' cpLuMmA PLANOGRAPH COHWASHINGTON, D. c.

RANSGM Y. BOV-EE, OF CHICAGO, ILLINQIS, ASSIGNOR TO B. A. FRANKLIN,TRUSTEE.

SCREW-CUTTER.

Application =fi1ed August 20, 1913.

To all whom it may concern Be it known that I, RANsoM Y. Bovnn, acitizen of the United States, residing at Chicago, in the county of CookandSta'te of Illinois, have invented certain new and'usefu'lImprovements in Screw -'Cutters, of which the following is aspecification.

This invention relates to screw cutters and its principal object residesin the provision of a' tool of simple construction which by adjustmentof its parts may be readily adapted for cutting internal and externalscrew threads of varying pitch and diameter.

An embodiment of my invention has been illustrated in the accompanyingdrawings in the various views of which like parts are similarlydesignated and in which,

Figure 1, represents a plan view of my improved screw cutter, Fig. 2, anedge view of the same looking in the direction of the arrow A, Fig. 1,Fig. 3, a longitudinal section along the line 33, Fig. 2 looking in thedirection of the arrow draw-n across said line, and Fig. 1, a sectiontaken along the line 4l, Fig. 1 drawn to an enlarged scale.

Referring to the drawings by numericalreference characters, 2 designatesa doublehandled die stock which is transversely d-ivided into twoaxially alined, complementary halves.

The parts 3 and at of the stock are movably connected at their adjacentends by means of a hinge 5 which projects outwardly from an edge of thetool, and they are adjustably maintained in their closed, operativeposition by means of a latch-bolt 6 applied at the opposite edge of thesame.

The bolt which is pivota'lly secured at one of its ends in a recess ofthe member '3 of the stock, normally projects through a longitudinallycut channel 7 in the other mem ber, and its threaded extremity isprovided with a nut 8 which by engagement with a shoulder 9 formed atthe end of the channel, may be used to draw the two parts of the stocktogether to any desired distance between their adjacent ends.

The body-portions of the two parts of the stock are each provided with acylindrical chamber 10 which is open at one side and closed at itsopposite side, and the handles 12 of the stock which extend oppositelyfrom the respective body portions of its halves, are hollow and providedat their ends with hinged, spring-held lids 13, for the storageSpecification of Letters Patent.

Patented Aug. 31, 1915.

Serial No. 785,735.

of a number of taps of difierent sizes as indicated at 14 in Fig. 3.

The hollows of the handles are separated from the chambers 10 by meansof partitions 15, and registering ports 16 formed in the adjacent endsof the stock parts in av plane of the longitudinal axis of the tool,serve to admit a piece placed between the said parts, to die-membersplaced inside the chambers as will hereinafter be more fully described.

The die-members above referred to consist of cylindrical blocks 17 ofhardened steel which are proportioned to occupy the chambers in thestock. They are each formed of an annular rim and an internal web whichhas a central opening to receive the pivot bolt by means of which themember is rotatably mounted in the respective chamber of the stock part.

Each of the two die members has in the peripheral surface of its rim,threaded grooves 1 9 of difierent diameterswhich in cotiperation withcorresponding grooves in the other member are adapted for cuttingexternal screw threads on a piece inserted between the parts of the diestock through an opening formed by registering notches 18 cut in theiradjacent ends in the closed sides of their respective chambers.

In addition to the above mentioned threaded grooves, the die membershave in their peripheral surfaces, angular grooves 20 which by properadjustment of the mem bers may be combined to provide sockets for thereception of the squared end of the taps 14 when inserted between thehinged parts of the stock.

The chambers 10 of the stock parts are provided internally, at theirclosed sides, with concentric bosses 21 which are formed to fit insidethe annular rims of the diemembers to determine the proper centralposition of the latter in the chambers they occupy.

The bolts 22 by means of which the die members :are rotatably mounted intheir respective chambers are at the ends of their stems screwed intocentral openings in the side walls of the chambers and theirtransversely nicked heads 24 are formed to fit loosely within theportions of the die rims opposite .to those :occupied by the bosses 21.

The webs of the die members have concentric series of substantiallyequidistant apertures 23 which are arranged respectively in the radiipassing through the peripheral grooves of the members, and which areadapted to receive the ends of locking pins 25 screwed in threadedopenings formed in the closed side of the stock members in the plane ofthe longitudinal axis of the tool.

When by adjustment of the two rotary die members, correspondingperipheral grooves thereof are brought into register in the plane abovementioned, to receive a piece inserted between the stock parts throughthe opening formed by the notches 18 in the closed side of theirchambers, the respective apertures in the webs of the said members areaxially in alinement with the locking pins which by entering the samerigidly secure the members in their adjusted positions.

From the foregoing description the operation of my improved tool may bereadily understood.

By withdrawing the pivot screws 22 sufficiently far to permit the diemembers to turn free from the ends of the locking pins, the said membersmay be readily adjusted to bring any pair of complementary grooves intheir peripheries in register in the plane of the longitudinal axis ofthe stock, for the purpose of cutting external threads of any desiredpitch or for holding taps-of any gage, within the range of the tool.

By adjustment of the nut 8 on the latch bolt the space between the twomembers of the stock may be varied to regulate the diameter of theincision made by the threaded die grooves or to clamp a tap securely inposition, and in this connection I wish it understood that by graduatingthe bolt as shown at 26 in Fig. 3, the distance between the twodie-members may be measured to determine whether the thread cut by theircooperative action is oversize, standard or undersize.

Inasmuch as the die members are reversible in their respective chambers,a finished thread can be cut down to a fiat surface and by virtue of theprojecting position of the hinge 5, the members of the stock may befolded together to permit of placing the tool in a comparatively smallspace.

By reason of the hinged connection of the stock member the dies may beclosed around a piece to be threaded at any desired point thereof andthe use of a guide or follower to start the thread at the proper angleis thus rendered unnecessary, while a thread can be rechased at anypoint without having to run the tool down the entire thread of the piecein which the thread is formed.

It is obvious that by providing extra sets of dies, the range of thetool may be inextending concentrically in said chambers from theirclosed sides, die members disposed in said chambers to cooperativelyengage a piece placed between said parts, through said ports, and eachcomposed of an annular rim provided with a series of if peripheralgrooves and an internal web having a corresponding concentric series ofapertures, the bosses on the said parts being adapted to occupy theinterior of the respective members at one side of their webs,

pivot bolts screwed into the closed sides of said chambers to rotatablysecure the mem bers within the same, and provided with heads adapted tooccupy the interior of the said members at the opposite sides of theirwebs, and lock pins secured in the closed sides of the chambers to entersaid apertures for locking the members in their adjusted positions onthe respective stockparts.

2. A screw cutter comprising a die stock composed of two parts connectedby a hinge and having cylindrical chambers open at one of their sidesand provided with ports which register when said parts are'in their iclosed position, the said parts having bosses extending concentricallyin said chambers from their closed sides, hollow, peripherally grooveddie members disposed in said chambers to cotiperatively engage a pieceplaced 1 between said parts, through said ports, the bosses on the saidparts being adapted to occupy the interior of the respective members atone of their sides, pivot-bolts screwed into the closed sides of saidchambers to rotatably secure the members within the same and providedwith heads adapted to occupy the interior of the members at the oppositesides of the same, and means for securing the members in a plurality ofdeterminate positions on the respective stock-parts.

In testnnony whereof I have affixed my signature 1n presence of twowltnesses.

RANSOM Y. BOVEE.

Witnesses:

Gr. A. HENDRIOK, B. B. Bovnn.

@ies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). C.

